Naked Motorcycles
2025Janus Gryffin 450
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The 2025 Janus Gryffin 450 is a classic-styled middleweight motorcycle powered by a reliable 445cc SWM single-cylinder engine producing 30 horsepower. Best suited for riders seeking vintage aesthetics with modern fuel injection and dependable performance, it excels as an accessible everyday commuter and weekend cruiser. Its efficient air-oil cooling and dry-sump lubrication deliver consistent reliability for casual riders prioritizing character over raw power.
- Capacity
- 445.0 ccm
- Engine
- Single, four-stroke
- Gearbox
- 5-speed
- Dry weight
- 149.7 kg
- Seat height
- 813 mm
- Power
- Not on record
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How it rides
Editorial estimate from the spec sheet - not lab tested- Best for
- It's built for leisurely, character-filled rides on backroads rather than for speed or long-distance touring capability.
- Built for
- The Gryffin 450 is a quirky, retro-styled single with a boutique feel, offering a slow, tactile, mechanical riding experience over modern refinement.
- Not ideal for
- This isn't the machine for riders wanting highway speed, aggressive cornering performance, or serious off-road capability.
Scores are derived from the spec sheet using the same model across every bike, so they compare like for like.
Will it fit you?
Worked out in your browser - nothing is sent to usRange and running costs
Worked out in your browser - nothing is sent to usBased on the published US (EPA-style) fuel economy estimate and tank size. Real-world figures depend on how and where you ride, and the last litres of a tank are reserve. Prices shown greyed are examples - type your own.
Engine
- Capacity
- 445.0 ccm
- CO2 Emissions
- 81 CO2 g/km
- EPA Est. Fuel Consumption
- 3.45 L/100km (68.2 US mpg)
- EPA CO Emissions
- 5.9 CO g/km
- Engine type
- Single, four-stroke
- Compression
- 10.1:1
- Cooling system
- Oil & air
- Fuel system
- Injection
- Starting
- Electric
- Ignition
- CDI
- Aspiration
- Naturally aspirated
- Valves per cylinder
- 4
- Lubrication system
- Dry sump with gerotor pump, cartridge filter, and oil cooler
- Power
- Not on record - add it
- Torque
- Not on record - add it
Transmission
- Gearbox
- 5-speed
- Transmission type
- Manual
- Final drive
- Chain
- Clutch
- Wet multiplate
Performance
- Top speed
- 144.8 km/h (90.0 mph)
Dimensions & weight
- Wheelbase
- 1346 mm
- Overall length
- 2108 mm
- Seat height
- 813 mm
- Dry weight
- 149.7 kg
- Fuel capacity
- 8.30 litres
Chassis & suspension
- Frame
- DOM tubular steel double cradle
- Front suspension
- Proprietary leading-link fork with dual progressive coil-over Ikon shocks
- Rear suspension
- Proprietary swing-arm with dual progressive coil-over Ikon shocks
- Front wheel travel
- 140 mm
Brakes & wheels
- Front brakes
- Single disc. Two-piston caliper, Brembo
- Rear brakes
- Single disc. Single Piston caliper, Brembo
- Front tyre
- 2.75-21
- Rear tyre
- 4.60-17
Other
- Color options
- British Racing Green, custom colours
- Comments
- US brand.
Compiled from manufacturer documentation and user contributions, corrected on an ongoing basis. Spotted something wrong? Tell us.
What changed, year to year
Differences highlighted| Specification | 2025 | 2026 |
|---|---|---|
| Capacity | 445 cc | 445 cc |
| Dry weight | 150 kg | 150 kg |
| Seat height | 813 mm | 813 mm |
| Fuel capacity | 8.3 L | 8.3 L |
Illustrative - generated automatically by diffing the year records already on file, not a manufacturer-published changelog.
Rider Reviews
Common questions
What is the engine size of the Janus Gryffin 450?
The 2025 Janus Gryffin 450 has a Capacity of 445.0 ccm (27.16 cubic inches).
How many gears does the Janus Gryffin 450 have?
The 2025 Janus Gryffin 450 has a Gearbox of 5-speed.
How much does the Janus Gryffin 450 weigh?
The 2025 Janus Gryffin 450 has a Dry weight of 149.7 kg (330.0 pounds).
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